铝碳酸镁/溴氧化铋异质结的制备及光催化性能研究

Synthesis and Photocatalytic Performance of Aluminum Magnesium Carbonate/BiOBr Heterojunctions

溴氧化铋(BiOBr)被认为是最有前景的光催化材料之一,但是其对可见光吸收较小、电子-空穴复合率高、吸附性较差的问题导致其光催化性能不尽人意,限制了溴氧化铋的广泛应用。针对上述问题,构建了铝碳酸镁/溴氧化铋异质结光催化剂,以提高其光催化性能。研究结果表明:铝碳酸镁的加入调节了溴氧化铋的能带结构和吸附性能、提高了可见光的吸收、促进了光生电子-空穴对的分离。此外由于两者独特的能带结构形成了Z型异质结。相较于纯铝碳酸镁和纯溴氧化铋,异质结光催化剂光催化降解盐酸四环素(TC-HCl)的能力有了显著提升,并且在模拟真实废水的复杂离子环境中依然保持较高光催化活性。证明了铝碳酸镁/溴氧化铋Z型异质结是十分有前景的光催化剂。

Bismuth oxybromide(BiOBr)is considered to be one of the most promising photocatalytic materials,but its low absorption of visible light,high electron-hole recombination rate,and poor adsorption ability lead to unsatisfactory photocatalytic performance,which limits its wide application.To solve these problems,a heterojunction photocatalyst was constructed to improve its photocatalytic performance.The results showed that the addition of aluminum magnesium carbonate(suggested using chemical formula here and thereafter)could regulate the band structure and adsorption properties of bismuth oxybromide,therefore improved the absorption of visible light and promote the separation of photogenerated electron-hole pairs.In addition,a Z-scheme heterostructure was formed thanks to the unique energy band positions of the two components.The photocatalytic degradation of tetracycline hydrochloride(TC-HCl)by heterojunction photocatalyst was significantly improved compared with pure aluminum magnesium carbonate and pure bismuth bromide,and it still maintained high photocatalytic activity in the complex ionic environment simulating real wastewater.It was proved that the Z-type heterojunction of aluminum magnesium carbonate/bismuth oxybromide is a very promising photocatalyst.